complete, total
tight
partial
economic, military, naval
road
effective

impose
end, lift, remove
enforce, maintain
tighten
ease, relax
break, break through, get through, run
They attempted to break the blockade by using submarines.

form
The group then formed a blockade across the road.

blockade against
the need to enforce a naval blockade against the country

blockade around, blockade round (esp. BrE)
a blockade around the city

blockade by
the blockade by Western nations

blockade of
a complete blockade of the island

Blockade is used with these nouns as the object:
road